<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
</head>
<body>
  <script>
    function payMoney() {
      var total = 1000;
      return function(momey) {
        total = total - momey;
        console.log(`还剩${total}元`);
      }
    }
    var pay = payMoney();
    pay(100)
    pay(200)
  </script>
</body>
</html>